US2110193A - Electromagnetic reproduction of sound and other wave motions - Google Patents

Electromagnetic reproduction of sound and other wave motions Download PDF

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Publication number
US2110193A
US2110193A US284020A US28402028A US2110193A US 2110193 A US2110193 A US 2110193A US 284020 A US284020 A US 284020A US 28402028 A US28402028 A US 28402028A US 2110193 A US2110193 A US 2110193A
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US
United States
Prior art keywords
armature
sound
pole
magnet
electromagnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US284020A
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English (en)
Inventor
Frank M Best
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DOROTHY SPARROW BEST
Original Assignee
DOROTHY SPARROW BEST
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Filing date
Publication date
Application filed by DOROTHY SPARROW BEST filed Critical DOROTHY SPARROW BEST
Priority to US284020A priority Critical patent/US2110193A/en
Priority to FR676389D priority patent/FR676389A/fr
Priority to GB17771/29A priority patent/GB313406A/en
Application granted granted Critical
Publication of US2110193A publication Critical patent/US2110193A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type

Definitions

  • n invention relates a new and improved method for the electromagnetic reproduction of sound and other wave motions, and a new and I ⁇ improved mechanism therefor.
  • One of the'objects of'iny invention isto provide a new and improvedj method whereby the audiojcurrents produced bya radio receivingset, electric pick-up, or the like,lcan be' caused to reproduce the original sound waves, with great 10 volume, and" also with substantially uniform fidelity over a. very wide range of tone.
  • Another object of my invention is to provide "anf'improved driving unit for telepho'nes,loud speakers or the like, which can deliver sound of 15 great volumeand'of correct tone.
  • Another object of my invention is to provide a driving unit in which sound waves, or other similar waves having frequencies above the audiblerange, shall be reproducedby means of waves zo electromagnetically inducedin a suitable armature, and with little or' no bodily movement of the armature itself.
  • the present invention also contemplates an electromagnetic device for translating. electrical 25 vibrations into mechanical vibrations wherein V this translation "15 accomplished vby, vibratory v movements within an armature supported in sorigid a manner to mecanicmovable. It has a stationary magnetiza'ble field. structure provided with 30 fixed field coils'to receive the voice currents (or other current's of an'inconstant nature), and an armature rigidly connected to a resonator such as'a sounding board, anda rigid mounting for the armature.
  • the preferably form of resonator is made of light wood such as spruce impregnated with rubber solution or natural latex, the rubber being inthe unvulcanized state.
  • These sounding boards may range in size. from 40 20 ⁇ : 30in. to 20 x 32 ft. ,When so operated these a sounding boards (made for exampleasshown in my application Serial No. 458,598, filed May 31, 1930, Methods of, and. apparatus for utilizing energy of a vibratory nature) are capable of re- 45 producing sounds throughoutthe entire audible range from 13 vibrations to 17,000 vibrations per "second and indeed go far above the limits of audibility, forexample to at least 40,000 vibrations per second. 'Thesesounding boards may be 50 from one-half to, one-quarter of an inch thick and are secured to exceedingly rigid supports which in-turn carry the field structure 'of the electromagnetic units so that there is no possibility of movement of the unit relative to the resonator.
  • One or more units may be employed and the (Cl'. 179-110) V armature of each unit is rigidly connected to the sounding board.
  • Each specific area of the resonator has a natural frequency and these natural frequencies extend throughout the range above given. "When the coils of the units are 5 energized, the particular area of the sound board or resonator having the natural frequencies of the energizing current receives, this vibratory energyand acts as a reflex driver to multiplythe efiect many times.
  • the resonator is so rigid and strong that the unit does not have thepower that would be required for bending or deflecting it (as a beam) but yet it may be set into violent vibration by a very small input in the voice coils. With other forms of resonator or driver the armature 15 may be made to vibrate at frequencies in the order of several hundred thousand gycles per second.
  • H Fig. 1 is a top view illustrating one'emb'odiment of. my invention.
  • Fig. 5 is'a diagrammatic view of one of the circuits that may be employed. I v
  • the armature is rigidly mounted so that if there is any movement thereof as a whole, it' is imperceptible.
  • the varying electromagnetic field produced by the audio current is utilized for producing vibratory waves in the material or the armature itself unaccompanied by bodily movement. These waves may be compared with the waves in a sonorous body such as agbell', a length of railroad tr I f across the adjacent air gaps. I prefer .to so wind or'the like; when tapped by a light blow. Such a blow produces a large volume of sound without bodily movement.
  • the wavesiproduced in the armature are (taken up by the rigid support and "reflexed or reflected baclr'and forth by it so as to build 111 5 *the amplitude-of the vib ation without bodily movement. 'These' amplified waves are transmittedto the diaphragmor other'mechanical element which produces sound waves.
  • one of the embodiments "jofmy device comprises a magnet M 'whichmay eitherbe a, permanent magnet orfmay' havea field coil.
  • M which may eitherbe a, permanent magnet orfmay' havea field coil.
  • ,I have found that satisfactory results 1 can be secured witna; permanent magnet satugrated'so as, to have a maximum pull.
  • the mag- I net is provided with polepieces l and 2, which are provided with inwardly directedprojections 3.
  • l. 5 andirfFour'audio or actuating cells C are wound 'uponthe extensionsl, l, 5 and, the
  • said coils beingarranged in pairs, each pair being located upon apair of adjacent pole piece extensions;
  • armature A may bemade of soft".iron, or any terial I having'f little for no A yoke Y has" its endsconnected to the pole pieces and to their extensions by meansoiibolts I and and nuts 9 and 10.:
  • Theiblock B is connected to yoke'Y'by screw H.
  • 'A terminal member II is clamped between nut l0 and an upper nut l0.
  • 'I'heterminal member H' is made of insulating material andtwo binding posts I2 having terminal lugs l6 are mounted thereon.
  • Theleads L for the, coils Care connected to'said "binding posts.
  • the coils C' may be connected in any suitable manner, to vary the impedance of the circuit as desired.
  • the four coils C are shown as connected in seriesparallel, to provide a circuit 01 maximum impedancepbut thi's'is merely illustrative.
  • the rubber being in the unvulcanizedstate.
  • I alsomay use several units with a single sound ing board capable of vibration over a wide range, each unit being intended to reproduce a given range of tones, as determined by the characteristics of the immediate neighborhood of the sounding board.
  • the units for reproducing the higher tones are at or near the centre of the 4 flat sounding board.
  • the block B is rigidly conv nected by screw I to the middle of yoke Y.
  • the arm A and block B could be made of brass, bell metal or other non-permeable material.
  • the yoke Y is made of non-permeable material.
  • a loud speaker unit having two pairs of pole members, an armature made of permeable material and located between the pole members, said armature having a rigid support so as to be bodily immovable, so that four air gaps of substantially constant width are formed in the magnetic circuit, and coil means associated with each pole member and adapted to vary the flux through said air gaps and set up vibration within the armature and its support without producing bodily movement of either the armature or its support.
  • a loud speaker unit having two pairs of pole members, an armature made of permeable material and located between the pole members, said armature having a rigid support so as to be bodily immovable, so that four air gaps oi. substantially constant width are formed in the magnetic circuit, and coil means associated with each pole member and adapted to vary the flux through said air gaps and set up vibration within the armature and its support without producing bodily movement of either the armature or its support, said coil means comprising four coils respectively located on said pole members.
  • a loud speaker driving unit comprising a magnet, and a sub-unit connected to the pole portions of said magnet, said sub-unit comprising a yoke, each end of said yoke having a pole-piece and two pole-piece projections connected thereto, each pole piece being intermediate two polepiece projections, a supporting block connected to said yoke intermediate the ends thereof, said block having an armature rigidly connected thereto, said armature being located intermediate the adjacent ends of said pole-piece projections to form four air gaps in the magnetic circuit, coils respectively wound on said pole-piece projections, said sub-unit being directly connected to said end-portions of the magnet through said pole-pieces.
  • a loud speaker operating unit comprising a support, a stationary magnet carrying a plurality of pairs of rigid, immovable pole pieces, energizing coils wound about the pole pieces and arrangedto produce opposite poles adjacent an armature, an armature having tips close to the pairs of pole pieces and mounted on the support, the support being substantially rigid when subjected to attractive forces within the power of the magnet, and a connection from the armai ture for transmitting sound wave vibrations therein to a sonorous body.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Percussion Or Vibration Massage (AREA)
US284020A 1928-06-09 1928-06-09 Electromagnetic reproduction of sound and other wave motions Expired - Lifetime US2110193A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US284020A US2110193A (en) 1928-06-09 1928-06-09 Electromagnetic reproduction of sound and other wave motions
FR676389D FR676389A (fr) 1928-06-09 1929-06-08 Procédé et dispositif pour la reproduction électromagnétique du son
GB17771/29A GB313406A (en) 1928-06-09 1929-06-10 Method and apparatus for the electromagnetic reproduction of sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US284020A US2110193A (en) 1928-06-09 1928-06-09 Electromagnetic reproduction of sound and other wave motions

Publications (1)

Publication Number Publication Date
US2110193A true US2110193A (en) 1938-03-08

Family

ID=23088552

Family Applications (1)

Application Number Title Priority Date Filing Date
US284020A Expired - Lifetime US2110193A (en) 1928-06-09 1928-06-09 Electromagnetic reproduction of sound and other wave motions

Country Status (3)

Country Link
US (1) US2110193A (fr)
FR (1) FR676389A (fr)
GB (1) GB313406A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062926A (en) * 1959-03-20 1962-11-06 John J Ronci Magnet with vibratable armature
US3112375A (en) * 1960-01-20 1963-11-26 Mechanies For Electronic Inc Loudspeaker construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062926A (en) * 1959-03-20 1962-11-06 John J Ronci Magnet with vibratable armature
US3112375A (en) * 1960-01-20 1963-11-26 Mechanies For Electronic Inc Loudspeaker construction

Also Published As

Publication number Publication date
GB313406A (en) 1930-05-01
FR676389A (fr) 1930-02-21

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